Default (XU) Whatsapp message preview in GB

how can i have message previews like in jb in the statusbar at gb? because in gb theres always only "4 messages in 2 chats" but i wanna see the message like in jb.

does anybody know how to do that?
( i want that feature in gb, cause gb ist the best for xperia u and i really need this feature, so im stuck on jb -.-)